1 package antlr;
2
3 * <b>SOFTWARE RIGHTS</b>
5 * <p>
6 * ANTLR 2.5.0 MageLang Institute, 1998
7 * <p>
8 * We reserve no legal rights to the ANTLR--it is fully in the
9 * public domain. An individual or company may do whatever
10 * they wish with source code distributed with ANTLR or the
11 * code generated by ANTLR, including the incorporation of
12 * ANTLR, or its output, into commerical software.
13 * <p>
14 * We encourage users to develop software with ANTLR. However,
15 * we do ask that credit is given to us for developing
16 * ANTLR. By "credit", we mean that if you use ANTLR or
17 * incorporate any source code into one of your programs
18 * (commercial product, research project, or otherwise) that
19 * you acknowledge this fact somewhere in the documentation,
20 * research report, etc... If you like ANTLR and have
21 * developed a nice tool with the output, please mention that
22 * you developed it using ANTLR. In addition, we ask that the
23 * headers remain intact in our source code. As long as these
24 * guidelines are kept, we expect to continue enhancing this
25 * system and expect to make other tools available as they are
26 * completed.
27 * <p>
28 * The ANTLR gang:
29 * @version ANTLR 2.5.0 MageLang Institute, 1998
30 * @author Terence Parr, <a href=http://www.MageLang.com>MageLang Institute</a>
31 * @author <br>John Lilley, <a href=http://www.Empathy.com>Empathy Software</a>
32 */
33 * data structure that holds a grammar in memory.
35 * This data structure can be used for static
36 * analysis or for dynamic analysis (during parsing).
37 * Every node must know which grammar owns it, how
38 * to generate code, and how to do analysis.
39 */
40 abstract class GrammarElement {
41 public static final int AUTO_GEN_NONE = 1;
42 public static final int AUTO_GEN_CARET = 2;
43 public static final int AUTO_GEN_BANG = 3;
44
45 * Note that Java does static argument type matching to
47 * determine which function to execute on the receiver.
48 * Here, that implies that we cannot simply say
49 * grammar.generator.gen(this) in GrammarElement or
50 * only CodeGenerator.gen(GrammarElement ge) would
51 * ever be called.
52 */
53 protected Grammar grammar;
54 protected int line;
55
56
57 public GrammarElement(Grammar g) {
58 grammar = g;
59 }
60 public void generate() {;}
61 public int getLine() {
62 return line;
63 }
64 public Lookahead look(int k) { return null; }
65 public abstract String toString();
66 }
67